Have you thought about bug net clothing at all? Or are you doing a lot of bushwacking?
A couple of summers ago, we went to Alaska, and beside having record breaking heat, they were also having crazy mosquitoes. In Fairbanks, at the start of the near perpetual dusk, when we got out of the car to go into this guys cabin, it was almost like dark clouds of mozzies (he was located outside of Fairbanks proper, in the woods). I've never seen anything like before or since.
I brought some bug net clothing, and was very grateful i did. In fact, most of the trip i was very glad i brought it.
No messy or smelly creams or sprays, no worries about chemicals at all. It did cut the wind a bit, which in the heat, sucked a bit, but it really wasn't that bad. I wore shorts with over sized bug net pants, a hat with a bug net over same. I didn't wear a bug net top though, just light colored, cool ls shirts that were just tightly woven enough to keep them from biting through overmuch.
Anyways, a lot of folks here seem to use permethrin. The stuff you soak your clothes in, and will kill the mozzies after exposure to same.